linux-kernel - [PATCH] ipc:msg: Replace zero-length arrays with DECLARE_FLEX

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Message-Id: <20230731022557.25598-1-rauji.raut@gmail.com>
Date:   Sun, 30 Jul 2023 19:25:57 -0700
From:   Atul Raut <rauji.raut@...il.com>
To:     linux-kernel@...r.kernel.org
Cc:     linux-kernel-mentees@...ts.linuxfoundation.org
Subject: [PATCH] ipc:msg: Replace zero-length arrays with DECLARE_FLEX_ARRAY() helper

Replacing zero-length arrays with C99 flexible-array members
because they are deprecated.
Use the new DECLARE_FLEX_ARRAY() auxiliary macro instead of defining
a zero-length array.

This fixes warnings such as:
./ipc/msg.c:981:6-11: WARNING use flexible-array member instead (https://www.kernel.org/doc/html/latest/process/deprecated.html#zero-length-and-one-element-arrays)

Signed-off-by: Atul Raut <rauji.raut@...il.com>
---
 ipc/msg.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/ipc/msg.c b/ipc/msg.c
index fd08b3cb36d7..300c126faf2d 100644
--- a/ipc/msg.c
+++ b/ipc/msg.c
@@ -978,7 +978,7 @@ SYSCALL_DEFINE4(msgsnd, int, msqid, struct msgbuf __user *, msgp, size_t, msgsz,
 
 struct compat_msgbuf {
 	compat_long_t mtype;
-	char mtext[1];
+	DECLARE_FLEX_ARRAY(char, mtext);
 };
 
 long compat_ksys_msgsnd(int msqid, compat_uptr_t msgp,
-- 
2.34.1